Her set of dominoes was collected from the Carmelite community of Leadore, Idaho. Hazlett taught at Bryn Mawr College, Mount Holyoke College, and the University of Illinois, after which she moved to Peterborough, N.H. Hazlett (1890–1974), one of America's leading mathematicians during the 1920s. In order not to leave empty space in the box, five completely blank tiles were included in this set of Double Twelve dominoes. For the Double Twelve set, n+1 is 13 so there are (13)(14)/2 or 91 tiles. Other common Double n sets include Double Nine, Double Twelve, Double Fifteen, and Double Eighteen. For a set of Double Six dominoes n+1 is 7 so we get (7)(8)/2 or 28 tiles. A mathematical formula known for many centuries says that the sum of the first n integers is n( n+1)/2 so the sum of the first n+1 integers is ( n+1)( n+2)/2. This leads to a total of ( n+1)+ n+( n-1)+…+1 tiles, i.e., the sum of the first n+1 integers. I.e., there are n+1 tiles with one or both squares blank, n tiles with no blanks and 1 the smallest number of pips, and n+1- k tiles with no blanks and k the smallest number of pips. If we look at all be seven possible types of tiles in a Double Six set, we find that there are 7+6+5+4+3+2+1=28 tiles.Ī similar computation can be done for any Double n set of dominoes. In general when the smallest number of pips that appear on a square of a tile is k, the other square must have k, k+1, …, 6 pips on it, and it is always the case that there are 7- k numbers on the list k, k+1, …, 6. In this case there are six possibilities for the number of pips in the other square, i.e., 1 through 6. If the smallest number of pips is 1, neither square is blank and at least one square has a single pip. If the smallest number of pips is 0, at least one square is blank and there are seven possibilities for the number of pips in the other square, i.e., 0 through 6. In a Double Six set, one can see seven different types of tile depending on the smallest number of pips in one of its squares. The traditional American domino set is called Double Six, because each rectangular tile is made up of two squares with each square blank or marked with 1, 2, 3, 4, 5, or 6 pips. Five of these are completely blank and ninety-one are made up of two squares with each square either blank or marked with up to 12 spots, usually called pips. A sheet of instructions, “HOW TO PLAY DOMINOES,” is included in the box of ninety-six rectangular tiles.
All Hillsdale game tables ship ground freight.This set of Double Twelve Express Dominoes was made by the Embossing Company, an Albany, N.Y., firm that produced wooden blocks and puzzles. In these cases, shipping charges can exceed the cost of the item.Ģ We offer Express Shipping options on all items except Hillsdale game tables. There is a minimum 1-pound shipping charge on any item, including small items such as dice or checkers.
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When completing your Shipping Address during checkout, please make note of the following. Government requires that we send all shipments to APO/FPO addresses using the U.S. Double Mexican Train Dominoes set comes with 91 Classic Double Tiles, 4 Metal Trains, and a Wooden Hub in a Reusable Tin Case to make sure you have enough. Unfortunately, we cannot supply tracking numbers for shipments to APO/FPO addresses. Customers are responsible for any import charges (tax, duty, etc.)ĪPO AND MILITARY ADDRESSES - shipping via USPS Once your order ships, you will receive a tracking number by email. International orders can take up to 5 business days to ship. Packages are insured and fully trackable. We offer shipping to over 190 countries with United States Postal Service using Express Mail International. Orders received on weekends and on holidays will be processed the next business day. Orders received after 2pm will be sent out the following business day. 2įor same day shipping, where indicated, orders must be received before 2pm Eastern Time (New York) in order to ship same day. Only after you know the total charge, will you be asked to enter your payment information. Once you have finished shopping, you will be able to select Express Shipping options (Next Day Air, 2nd Day Air, 3-Day Select) on check-out. The shipping charges are calculated in real time by UPS. Look for the "FREE SHIPPING" designation.įor all other items, and for Express Shipping options, we use an integrated online UPS shipping calculator. We offer FREE ground shipping to the contiguous USA and Canada (Hawaii and Alaska are excluded) for many products.
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