The June issue of this magazine, by an unfortunate mistake, was printed upon the wrong kind of paper. A reprint has been made upon the regular paper. Any of our readers who contemplate binding the magazine when the volume is completed, may obtain a correct copy free by mailing us the old one, with name and address written upon the cover, so as to identify the sender.

This magazine will have an exhibit at the forthcoming exhibition of the Massachusetts Charitable Mechanics Association, opening Sept. 22 next. To add to the interest, and show the general public what Amateur Work readers are capable of doing, those interested in this magazine are invited to send for exhibition suitable objects which they have constructed, and which would be suitable for this exhibit. Before doing so, however, it will be advisable to communicate with the editor, sending particulars, and a photograph, if possible, to avoid duplication or overcrowding. Applications for space have been so general that the exhibition promises to be one of the best held for many years. All readers of this magazine who may visit it should not fail to see what Amateur Work will present.

The regular chapters on Mechanical Drawing will be omitted in this and the next number, as the subject is not one of general interest during the summer months. In the September number the first chapter of the series on Projection will be given. The chapters previously given have been of much interest to many of our readers. All those who desire to become proficient in mechanics should follow these studies as they appear, and will find themselves well repaid for so doing.

A new device for taking soundings will be used in determining the route of the projected Pacific cable. It consists of a large iron cylinder, topped by a cone and containing air. It is hermetically sealed, except when the cylinder is immersed. Then water flowing into the cylinder and through a tube has access to the cone containing the air. Working on the principle of hydraulics and gravitation it is possible to drop the cylinder to a reasonable depth, and the pressure is indicated on a dial attached to the cone. When the cylinder is drawn up, by taking the pressure and the depth and making the proper computations, the total depth of the sea at that point is determined.