Professor Trowbridge has had set up in the Jefferson Physical Laboratory recently a storage battery of great power. It has a voltage of 20,000, or forty times as great as the voltage required to run an electric car. This is probably the most powerful storage battery in the world. Professor Trowbridge employs it in the experiments which he is now conducting to determine the spectrum of hydrogen. It is also used in X-ray experiments, the first use of a storage battery for this purpose.
A cast of the Madonna of St. Lorenzo, Florence, has just been set up in the Fogg Art Museum. The cast was made in Paris and is a copy of Michael Angelo's finest Madonna. This is the only one in Boston, and probably the only one in the country.
A collection of 250 photographs of Constantinople, including a complete set of St. Sophia, has also been added and the thousand views of Spain have been catalogued.
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Co-operative Society Bulletin.
