No. 98. Lowell, Mass., July 10, 1905.

I would very much like to correspond with any readers of Amateur Work living in this sectton who are interested in wireless telegraphy. An interchange of ideas and the results of experimental work would undoubtedly prove profitable. Kindly address "Wireless" 54 Middle Street, Lowell, Mass.

Those at a greater distance than that mentioned above are invited to write their experiences for publication in this column that all readers may profit therefrom.

No. 99. Franklin Falls, N. H., July 12, '05.

Kindly advise if a glass plate condenser is as good as a Leyden jar for " Wireless " work. What will a thin glass tube 4 in. diameter and 8 in. long cost ? Also of hard rubber of same dimensions? C. E. H.

There is no appreciable difference if equally well made and of the same capacity. The tube, either of glass or rubber, would probably have to be made to order, and cost about $4 for glass and $2.50 for rubber. The glass tube might be made from a glass bottle, to be found by searching among glassware dealers.

No. 100. Somerville, Mass., July 8, '05.

How can I gain admittance to the stations of the United States Government wireless telegraph stations?

F. E. W

Write a letter to the Chief Electrician of the station you desire to visit, stating your request, which may or may not secure the desired permission, this depending greatly on the conditions of business duties. On certain days visitors are generally allowed at Navy yards, and you might try on one of these days.

No. 101. Minneapolis, Kan., July 7, '05.

Would you advise amateurs to buy magnet wire and attempt to wind a small spark coil for a 1/4 in. spark, and is it difficult to wind small coils ? D. N. R.

Success in coil winding depends largely on the skill of the operator and care taken in the work. The small size you mention should be an easy matter, but it would hardly seem worth while to fit up for a coil of that size. With larger coils the preliminary work of making a winder, etc., is, of course, a necessity. The work has an educational and instructive value, which makes it necessary for each one to decide for himself whether making or buying a coil is advisable.

No. 102. Providence, R. I., July 11, '05.

Please tell me the best kind of paper to use in a condenser for a 1-inch spark coil. I do not know the kind to use between the layers of tinfoil. D. C. W.

A strong waxed paper is placed between the differ-ent layers of tinfoil in a condenser. You may be able to find at a confectioner's or baker's paper which would be suitable, but each sheet must be carefully examined to see that it contains no pin holes. If unable to buy suitable waxed paper it may be made by dipping thin bond writing paper in melted paraffine, allowing same to become hard, and then pressing smooth with a flatiron slightly warmed. The latter paper will be best, being much stronger than any waxed paper you can ordinarily purchase.